Complex organisms with gills and lungs were major life forms that existed in the

Give three examples of plant activities that are affected by circadian rhythms and natural fluctuations in the length of daylight?

Viruses can be transmitted through air, water, food, insect bites, and direct skin contact. once a virus gains entry into the body, it invades a host cell in order to? a. synthesize antibodies for defense b. deactivate the host cell's defenses c. access cell processes for reproduction d. metabolize host proteins and grow

Which enzyme is responsible for “unzipping" the dna by breaking the hydrogen bonds between the nucleotides?